Sheet-feeding device with sheet separation by a blast of air



June 25, 1929. w. ROCKSTROH 1 SHEET FEEDING DEVICE WITH SHEET SEPARATIONBY A BLAST OF AIR Filed 00t- I5, 1928 //wenf0r:

Patented June 25, 1 929.

UNITED STATES. PATENT OFFICE.

WALTER BOOKSTRO H, OI POSTEL'WIT Z, NEAR BAD SCHANDAU, GERMANY.

SHEET-FEEDING DEVICE WITH SHEET SEP ARATIO N BY A BLAST OF AIR.

Application filed October 15, 1928, Serial No.-

In the sheet feeding devices in which the separation of the topmostsheet of a pile is effected through the intermediary of a blast of air,more or less air is introduced be- 5 tween the sheets according to thenature and weight of the paper. This air at the same time removes thedust from the sheet, which is well known to be an advantage of thismethod. This removalof dust is a disadvantage iniso far as the said dustis arbitrariiy blown into the machine room and thus soils the machine.This phenomenon is particularly prominent in sheet feeding devices, inwhich the separation of the sheet by means ofa blast of airtakes placeat the end of the pile opposite to the conveyor, because the dust-ladenstream of air is in such a case led directly into the machine dealingwith the sheet, so that more especially in so the case of paperscreating a considerable amount of dust, stoppages may be caused both inthe sheetfeedmg device and in the machine connected therewith;

This drawback is obviated a'ccording to at the invention by providin adust suction device. The invention is ilustrated in the accompanyingdrawing in Figure 1" in elevation while Figure '2 shows y way of ex-'ample a form of the suction device.

n. represents the ile of paper, resting on a table 6; c is therontsupporting ledge, da conveyor roller, which receives the sheet e812,728, and in Germany November 3, I827;

which happens to be at the'top, from the suction device 9, and deliversit to the table f. h is a suction device, which tilts up and 3sseparates the topmost sheet, 2' a nozzle, which assists the separationof the sheet and removes the dnst, k a box-shaped hollow body betweenpile a and conveyor roller J. This hollow body is provided in thepresent ex- 40 ample with apertures Z, through which the dust can besucked in. The further removal of the dust is effected through thetubular connection m. The nozzle 11 forces a stream of air under thetopmost the whirls of dust are at the same time blown towards theconveyor roller and withdrawn by suction by the hollow member Inconnected to a suction pump, the dust being rendered inocuous by meansof a filter.

What'I claim is A sheet feeding device having means for separating thesheets, said means comprising a. nozzle for introducing a stream of airunder the topmost sheet of a pile, andhellow members arranged in thedirection of the "stream of air and at the opposite end of the pile fromthe nozzle, whereby the dust disturbed by the stream of air is withdrawnby suction and rendered inocuous.

In testimony whereof I have signed my name to this specification.

'WALTER ROCKSTROHQ sheet 6, 45

